#include <AccelStepper.h>
AccelStepper stepper(1, 9, 8); // (Typeof driver: with 2 pins, STEP, DIR)

float maxSpeed = 2500;  // # of steps per second to speeed up to
unsigned long time;
unsigned long previousAccel = 0;
int interval = 100;  // # of milliseconds between speed increases


void setup() {

  stepper.setMaxSpeed(maxSpeed); // Set maximum speed value for the stepper
  //stepper1.setAcceleration(1500); // Set acceleration value for the stepper
  //stepper1.setCurrentPosition(0); // Set the current position to 0 steps
  stepper.setSpeed(10);
}

void loop() {
  while (stepper.speed() < maxSpeed) {
    time = millis();
    if (time > previousAccel + interval) {
      previousAccel = time;
      stepper.setSpeed(stepper.speed() + 20);
    }
    stepper.runSpeed();
  }
  stepper.setSpeed(maxSpeed);
  stepper.runSpeed();
}
  //stepper1.moveTo(1000); // Set desired move: 800 steps (in quater-step resolution that's one rotation)
  //stepper1.runToPosition(); // Moves the motor to target position w/ acceleration/ deceleration and it blocks until is in position
  //stepper1.runSpeed();

  // Move back to position 0, using run() which is non-blocking - both motors will move at the same time
  //stepper1.moveTo(0);

 //if (stepper1.currentPosition() != 0) {
    //stepper1.runSpeed();
    
 // }